Math & Science ⇒ chemfig | Compilation fails

[niteshs]

Hi!

I just discovered the awesome chemfig package but am having trouble getting it to work.

Here is an MWE:

Code: Select all

\documentclass{article}
\usepackage{chemfig}
\begin{document}
This is a test chem structure.
\chemfig{*6(-=*6(-(-Br)-(-Br))-=-=)}
And this is a test chem scheme.
\schemestart
A\hspace{0.5cm}+\hspace{0.5cm}B\arrow{<=>} AB
\schemestop
\end{document}

And here is the output:

chemfig.png (15.74 KiB) Viewed 5543 times

These are the errors:

• Two \documentclass or \documentstyle commands.
  Undefined control sequence \chemfig
  Undefined control sequence \schemestart
  Undefined control sequence A\hspace{0.5cm}+\hspace{0.5cm}B\arrow
  Undefined control sequence \schemestop

And here is the log file:

chemfig.log

(16.97 KiB) Downloaded 329 times

What is going wrong here?

[cgnieder]

It seems that chemfig was never loaded. The only reason I can think of that would also explain the first error

! LaTeX Error: Two \documentclass or \documentstyle commands.

You have named your file chemfig.tex but the chemfig package loads an internal file called chemfig.tex, too. It seems your file is loaded again instead of chemfig's own.

Try it with test.tex or something.

There's no need for the \hspace in the scheme, by the way:

Code: Select all

\schemestart
 A \+{.5cm,.5cm} B \arrow{<=>} AB
\schemestop

Regards

[localghost]

Never ever give a source file for your document the same name as a package.


Thorsten

[niteshs]

Thank you cgnieder and localghost!
It all makes sense now!